.wraper{ width:880px; padding-top:50px; margin:0 auto;right: 0;position: absolute}
.mynav{ position:fixed; width:100%; height:40px; background:rgba(93, 93, 97, 0.73); overflow:hidden;}
.nav-item{ position:relative; float:left; width:120px; height:40px; line-height:40px; text-align:center; font-size:14px; z-index:1}
.nav-item a{ display:block; height:40px; color:#fff; }
.nav-item a:hover{ color:#fff}
.move-bg{ display:none;position:absolute;left:0;top:0; width:120px; height:40px; background:#474245; z-index:0}
